140DDO84300
140DDO84300
140DDO84300
1． 输出方式的选择
开关量输出模块有三种输出方式：继电器输出、晶闸管输出和晶体管输出。继电器输出的价格便宜，既可以用于驱动交流负载，又可用于直流负载，而且适用的电压大小范围较宽、导通压降小，同时承受瞬时过电压和过电流的能力较强。但它属于有触点元件，其动作速度较慢、寿命短，可靠性较差，因此，只能适用于不频繁通断的场合。当用于驱动感性负载时，其触点动作频率不过1Hz。
对于频繁通断的负载，应该选用双向晶闸管输出或晶体管输出，它们属于无触点元件。但双向晶闸管输出只能用于交流负载，而晶体管输出只能用于直流负载。
备货，备货，降降降，火火火，火火火……
Nortel DMS SWITCH DMS-100 TDMA and CDMA
NORTEL DMS 250 NT9X Application Processor Cabinet
NORTEL PASSPORT 8010CO 8630GBR 8648GTR 8692SF 8005AC
NORTEL PASSPORT 8010 8630GBR 8648GTR 8692SF 8005AC
Nortel CDMA Metrocell Indoor 850 MFRM-2 or SFRM NTGS45
NEW BES-220-24T-PWR Nortel Ethernet Switch POE
Nortel CDMA Metrocell Outdoor W DE, RF, EBE 850 Mhz
Nortel EB1644027 Alteon Content Manager ACM-310-SM
NEW AVAYA DS1404109-E6 Nortel 8634XGRS Combo Routing Sw
Nortel DS1404112-E6 PASSPORT 8606XLRC ROUT SWCH MOD
Nortel Option 81C Disaster Recovery Backup Have RTU's
NEW AVAYA DS1404102-E6 Nortel 8648GBRS 48 port SFP Rout
NORTEL NTR651JX AUDIOCODES MEDIANT 2000 SIGTRAN SS7
Nortel DS1404113-E6 PASSPORT 8630GBRC ROUTING SWCH MOD
Nortel RNC8500
Nortel Networks Passport 15000 Chassis
Nortel Meridian Norstar Phone System PBX Computer T-1
NORTEL NETWORKS EB1639017
HUGE LOT: Nortel Optera Cards OCLD/OCM/OCI
NTB NORTEL MERIDIAN 1 OPTION 81C WORKING PULL MINT COND
Nortel Switched Firewall Accelerator 6600 EB1639113-E5
Nortel Norstar BCM 400 VOIP With 50-IP Phones i2004
Nortel EB1639039 Alteon Switched Firewall 5308
NORTEL NT0H19AA OPTERA METRO OTR B1 CH1 CARD WM2TJM0
DATA EDGE PRODUCT AL1001E15-E5-Nortel ERS5632FD Etherne
Nortel DS1404114-E6 PASSPORT 8626XGRC COMBO 1GE + 10GER
Nortel S12000 GSM BTS Base Station Cellsite 1900 Mhz
DATA EDGE PRODUCT AL1001E15-E5-Nortel ERS5632FD Etherne
Nortel NTHW25AA 4pOC3ChSmirVsp4e 15000 Passport Module
Nortel Passport 6480 Multiservice Edge Switch System AC
Nortel Passport 6480 Multiservice Edge Switch System AC
Nortel NTHW86CB instock sameday shipping make offer
Nortel ONS OPTera 5200 DWDM multi-service platform
NEW Nortel 8660SDM 2 IDS Module DS1404086-E5 2FE+2IDS
New Nortel 8626XGRC DS1404114-E6 Route Sw Mod MERS 8600
Nortel Switched Firewall Director 5026 P/N: EB1639131E5
Nortel Passport 8310 8348 TX PWR GTX 8393 SF POE Switch
Nortel Passport 6480 Multiservice Edge Switch System DC
Nortel Alteon EB SSL - new sealed
Nortel Meridian 1 PBX Telephone System - 8 Modules
NEW Nortel Networks VPN Extender Card NTNQ80AG Original
Nortel OPTera Metro 5200 OADM 10G GBE/FC MOTR
Nortel, AL1001E11-E5 ETHERNET ROUTING SWITCH 5698TFD-..
NORTEL SPME DMS COMPLETE SYSTEM NTLX
Nortel, NTHU60AA CS 1000E CPPM 0 LINE 0 TR HIGH
Nortel BCM 400 R4.0 VoIP Phone System T-1/PRI Voicemail
Nortel NTGZ70BA dual radio MFRM3 1900 MHZ
NORTEL NTNQ96AG NTNQ Two Port STM 1 optical Channelized
Nortel BCM400 4.0 BCM 400 R4.0 R4 1000vm dual PS/HD
Nortel NTHW86CB 4POC12SmlrAtm
Nortel NT0H15CD OPTera 5200 MOTR 10G GBE/FC,B3C4,1550
Nortel DS1404092-e5 PASSPORT 8648GTR SWITCH
NORTEL OPTERA NT0H18DA 5200 OCLD B-BAND WMTM70B
Nortel, AL1001E12-E5 ERS 5698TFD W/ 96 GETH 2 PORTs 1..
Nortel DS1404055-E5 PASSPORT 8632TXM ROUTING SWCH MOD
Nortel DS1404103-E5 PASSPORT METRO 8692OMSF SWCH
Nortel BCM 400 Bundle (8x32x0x2 + VM32)
Nortel, WL81LC128 WLAN 8100 128 AP LIC UPGRADE
Nortel Passport 8010 DSTXM Ethernet Routi
NEW AVAYA NORTEL BCM450 6.0 r6 r6.0 64 vm 64 um 65 ip
Nortel, WL81MG256 WLAN 8100 MANAGEMENT S/W ADD 256 APS
